What is the best way to delete cache for a group of arguments?

[mryangyu]

lets say I remembered by 2 arguments: a, b, and then I want to clear the cache for all a = 1 regardless what b is.

Thanks for the help.

[medikoo]

@mryangyu I think the only way to do it, would be by writing custom normalizer. What is the use case for that?

[medikoo]

I'm going to close this, but let's keep discussion open

[mryangyu]

I'm using it to cache web api requests for a given city and normalized query string. When users add records in a city I need to expire all the cache of a given city.

[medikoo]

@mryangyu then best thing you can do, is to write custom normalizer. e.g.:

var baseNormalizer = require('memoizee/normalizers/get-primitive-fixed')(2)
var citiesMap = Object.create(null);
var normalizer = function (args) {
    var city = args[0];
    if (!citiesMap[city]) citiesMap[city] = Object.create(null);
    citiesMap[city][args[1]] = true;
    return baseNormalizer(args);
};

var mfn = memoize(fn, { normalizer: normalizer });

mfn.clearByCity = function (city) {
    if (!citiesMap[city]) return;
    for (query in citiesMap[city]) mfn.delete(city, query);
    delete citiesMap[city];
};

Then use mfn.clearByCity(city) to clear all memoized calls for given city. I assumed that both city and query are strings in your case.

Let me know if something is not clear